16501056161 has 8 divisors (see below), whose sum is σ = 16533999144. Its totient is φ = 16468139520.

The previous prime is 16501056139. The next prime is 16501056163. The reversal of 16501056161 is 16165010561.

It can be written as a sum of positive squares in 4 ways, for example, as 5440537600 + 11060518561 = 73760^2 + 105169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16501056161 - 2⁶ = 16501056097 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16501056163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635071 + ... + 1645131.

It is an arithmetic number, because the mean of its divisors is an integer number (2066749893).

Almost surely, 2^16501056161 is an apocalyptic number.

It is an amenable number.

16501056161 is a deficient number, since it is larger than the sum of its proper divisors (32942983).

16501056161 is a wasteful number, since it uses less digits than its factorization.

16501056161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13171.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 16501056161 in words is "sixteen billion, five hundred one million, fifty-six thousand, one hundred sixty-one".